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Pressure Regulator Upstream Of A Gl Separator


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#1 joshugreat

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Posted 30 July 2014 - 10:45 AM

Hello Guys,

 

Is it  a good practice to have a pressure regulator directly upstream of a separator? I am thinking in terms of free lquid carryover. what are your thoughts?

 

In our gas meter station, we have a pressure regulator located upstream of the separator, which cuts the pressure from 800lbs to 400lbs. Downstream of the separator, the customer further cuts the pressure to below 100lbs. There have been free liquid issues at this point.

 

My initial thought is to instal a Desi-Dri downstream of the separator to further dry the gas before it gets to the customers pressure regulator. I appreciate your recommendations and feedbacks. thanks



#2 Art Montemayor

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Posted 30 July 2014 - 02:07 PM

Before we can give you some recommendations, can you clear up some things first?

  1. What do you mean by GL (or GI)?  Do you mean a gas-liquid separator?
  2. What kind of gas are you handling?  Is it natural gas?  If so, what is its composition?  If you don’t have a composition, can you at least tell us if it is saturated with water moisture?  Is it a “lean” gas (mostly methane) or a “rich” gas (high C2+ contents)?
  3. What liquids are you trying to separate?  Are they hydrocarbon liquids or liquid water?
  4. By “lbs” do you mean psig (or psia?)?
  5. What is a “Desi-Dri”?  Is it an adsorbent drying system?  Or is a dessicant chemical – like calcium chloride?
  6. Do your customers require a “dry” gas?  If so, what dew point (or water content) do you require?

Await response.



#3 joshugreat

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Posted 01 August 2014 - 01:30 PM

Art, thanks for your response, below are some clarifications:

 

1. GL: Gas liquid, 2 phase separator

 

2. It is a rich gas saturated with both water and heavy hydrocarbon. We currently have a gas processing facility upstream to knock off the heavy hydrocarbons and dry the gas. However we sometimes still have a gas composition with a water dew point > 7lbs/MMSCF going into the separator at the meter station.

 

3. At the meter station, i am more concerned with the water

 

4. I was refering to psig

 

5. they are dessicant tablets like Calcuim Chloride

 

6. Yes, they require a maximum water dew point of 4lbs/mmscf.



#4 Bobby Strain

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Posted 01 August 2014 - 04:03 PM

That woud be desiccant. Stuff you put in a dryer.

 

Bobby






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